'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Admin Template' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 9528 // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  // 切换相对路径
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  // 开发服务器 => 请求代理
  // 跨域问题 => 无法获取不同源的服务器 数据
  // 浏览器地址栏中的地址(http://localhost:9528/#/login?redirect=%2Fdashboard)
  // 和
  // 后端服务器的地址(https://heimahr.itheima.net:443/api/sys/login)
  // 不同源
  // 同源: 两个url的 协议(http/https) 域名(localhost/heimahr.itheima.net) 端口号(9528/443) 都相同   有一个不同就是不同源

  // 本质就是 你不要直接请求后端服务器 你应该请求代理(代购) 代理帮你请求服务器
  // 怎么配: 1.你得有代理-交代好代理去哪  2.后续找代理发请求
  // 如何解决:
  // 1. 代理服务器(经典-开发过程中需要客户端配置-上线时需要运维配置代理)
  // 2. cors(经典方案-需要服务端配置Access-Control-Allow-Origin)
  // 3. jsonp(适用于get请求 比较老)
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    proxy: {
      // 将来哪些请求需要代理   只有请求路径中含有/zs才走代理
      // 代理标识: 代理配置对象
      // 我们这次项目中的请求都有一个api前缀  => 即项目中所有请求都可以走代理了
      '/api': {
        // 目标地址 => 真正服务器地址
        target: 'https://heimahr.itheima.net/'
      }
    }
    // 请求之前 利用假数据模拟 => 有后端接口 不需要这个
    // before: require('./mock/mock-server.js')
    // src以外的文件修改必须重启项目生效
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    },
    // 打包时排除某些包
    externals: {
      'vue': 'Vue',
      'element-ui': 'ELEMENT',
      'cos-js-sdk-v5': 'COS'
    }
  },
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // 利用 svg-sprite-loader 处理svg图标
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
            // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // only package third parties that are initially dependent
                },
                elementUI: {
                  name: 'chunk-elementUI', // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'), // can customize your rules
                  minChunks: 3, //  minimum common number
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
          config.optimization.runtimeChunk('single')
        }
      )
  }
}
